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%I #8 Nov 03 2019 06:47:07
%S 0,1,0,0,-1,-1,0,0,-1,0,-1,0,0,0,0,0,0,0,-1,0,0,0,0,1,0,1,0,-1,-1,0,0,
%T -1,0,1,0,0,0,0,0,0,0,1,0,1,1,0,0,0,1,0,0,0,0,-1,1,0,0,-1,0,0,0,0,-1,
%U 0,0,1,0,-1,0,-1,0,-1,0,0,-1,0,0,-1,0,-1,0,0,0,0,0,0,0,0,0,0,1,-1,0,0,0,-1,0,0,0,0,0
%N Moebius function mu of the average of n-th twin prime pair.
%H Amiram Eldar, <a href="/A078580/b078580.txt">Table of n, a(n) for n = 1..10000</a>
%F a(n) = A008683(A014574(n)).
%t midQ[n_] := PrimeQ[n-1] && PrimeQ[n+1]; MoebiusMu[Select[Range[4000], midQ]] (* _Amiram Eldar_, Nov 03 2019 *)
%Y Cf. A008683, A014574, A078579.
%K sign
%O 1,1
%A _Reinhard Zumkeller_, Nov 29 2002
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